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With Travel Halted, What Happens To The Planes?

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langwadt:

--- Quote from: jogri on August 12, 2020, 09:05:55 pm ---
--- Quote from: langwadt on August 12, 2020, 08:20:13 pm ---sure brake pads and the time to change them cost money

--- End quote ---

Those are videos from runway 05R, the taxiway is at the end of a 3.2 km long runway so the pilot has to drive down the runway anyway to reach the gates... So why bother? It gives you a smoother landing, cuts down the time required to reach the gate and avoids the chance of foreign object damage. And since the plane doesn't land with its maximum take-off weight the brakes don't have to work that hard (a full 747 has fuel for 16h, and you typically have enough fuel for ~1h of flight left when you land, that alone can be a difference of up to 150 tons between take-off and landing)



--- Quote from: SkyMaster on August 12, 2020, 09:00:59 pm ---I would be surprised if it is possible to land a B747 at Maximum take-off weight (MTOW).

The flight manual and SOP (airline standard operating procedure) probably limit the weight at which the B747 can land. And, after taking off at MTOW, the B747 would not be at MTOW anyway... because... fuel burn  ;)

 :)

--- End quote ---

Well, you could probably get it down in one piece but at the cost of a totaled airframe... Or you cold proceed to dump 100 tons of fuel, but that's going to take some time (probably around an hour given that you first have to find an appropriate spot).

--- End quote ---

looks like landing a 747 at MTOW is not a big issue, https://www.boeing.com/commercial/aeromagazine/articles/qtr_3_07/article_03_3.html


SkyMaster:

--- Quote from: langwadt on August 12, 2020, 09:32:59 pm ---
...

looks like landing a 747 at MTOW is not a big issue, https://www.boeing.com/commercial/aeromagazine/articles/qtr_3_07/article_03_3.html

--- End quote ---

Wait a minute, in a previous post you claimed the B747 Maximum landing weight was 100 tons less than the Maximum take-off weight, and now you are saying that landing a B747 at a weight near MTOW is not a big issue?  ;)

The article you are referring to, at the beginning read "Landing overweight requires an overweight landing inspection with its associated cost.", and then near the end, read "... The Boeing airplane maintenance manual (AMM) provides a special inspection that is required any time an overweight landing occurs, regardless of how smooth the landing.".

I think the article's intent is to claim that the Boeing 747 structure is designed to survive such an abnormal situation, without damage.

 :)

langwadt:

--- Quote from: SkyMaster on August 12, 2020, 10:15:17 pm ---
--- Quote from: langwadt on August 12, 2020, 09:32:59 pm ---
...

looks like landing a 747 at MTOW is not a big issue, https://www.boeing.com/commercial/aeromagazine/articles/qtr_3_07/article_03_3.html

--- End quote ---

Wait a minute, in a previous post you claimed the B747 Maximum landing weight was 100 tons less than the Maximum take-off weight, and now you are saying that landing a B747 at a weight near MTOW is not a big issue?  ;)

The article you are referring to, at the beginning read "Landing overweight requires an overweight landing inspection with its associated cost.", and then near the end, read "... The Boeing airplane maintenance manual (AMM) provides a special inspection that is required any time an overweight landing occurs, regardless of how smooth the landing.".

I think the article's intent is to claim that the Boeing 747 structure is designed to survive such an abnormal situation, without damage.

 :)

--- End quote ---

yes, so while you should preferably to stay below maximum landing weight, if you have to, even a hard landing at MTOW is
not going to make the plane fall apart it just needs an inspection.

one of allowable reasons for an overweight landing is "Serious illness of crew or passengers which would require immediate medical attention."  If there was a serious risk from an overweight landing I doubt someone needing medical attention would be a good enough reason




SkyMaster:

--- Quote from: langwadt on August 12, 2020, 10:36:42 pm ---

yes, so while you should preferably to stay below maximum landing weight, if you have to, even a hard landing at MTOW is
not going to make the plane fall apart it just needs an inspection.

one of allowable reasons for an overweight landing is "Serious illness of crew or passengers which would require immediate medical attention."  If there was a serious risk from an overweight landing I doubt someone needing medical attention would be a good enough reason

--- End quote ---

Well, a hard landing on a large aircraft is serious situation. The option of landing overweight is going to be specified in the airline's SOP (Standard operating procedures).

Below is what a hard landing can do:



This occurred during a test flight; the test plan was not calling for a hard landing, the crew inadvertently did a hard landing. An FAA inspector was standing up at the time of the landing and the impact was such that he broke an ankle. And for the aircraft damage, you can watch the video, it is only a few seconds long. Among other things, you will see the fuselage flex like a wet noodle; but this is not all. And this was a DC-9; a little bird.

 :)

Alex Eisenhut:
Best use of a thrust reverser



Saab makes some intense-looking airplanes.

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